How to Convert an Image Online to JPG, PNG, WebP, AVIF or ICO

Updated

Open a browser-based converter such as UpperPix, drop your image in, pick the target format, and download the result — no registration or upload to a server is required for the conversion step. This works when you need a quick format change for a single image or a small batch, and when you already know roughly what the file is for. It is not the right approach if you need color-managed output for print, layered editing, or conversion of a format the tool does not list.

What you need before starting

  • A source image in a supported format. UpperPix lists JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, and SVG as accepted inputs.
  • A target format that matches your use case (see the table below).
  • A browser. The tool runs locally, so the file is processed on your machine rather than uploaded.

Step-by-step conversion

  1. Open the converter. On UpperPix, the image converter sits alongside the editor and other tools. You can choose between two editors — Editor 1 is described as full-featured with pro tools, Editor 2 as a lighter, faster-loading option — but for a plain format change you do not need either.
  2. Add your image. Drag the file onto the drop area or click to browse your computer. The accepted list is JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, SVG.
  3. Choose the output format. The available targets are JPG, PNG, WebP, AVIF, ICO, and BMP.
  4. Adjust quality if relevant. A quality slider is available, shown at 90% by default in the converter. Lower values shrink the file; higher values preserve detail.
  5. Convert and download. Click convert, then download the resulting file.

If you are producing a favicon rather than a general image, the ICO path is different: you select which sizes to include (16×16, 32×32, 48×48, 64×64) and generate the ICO file, which is built with multiple sizes embedded.

Choosing the right target format

Format Best for Key trade-off
JPG Maximum compatibility, photos, email attachments Lossy; no transparency
PNG Lossless output, images needing an alpha channel Larger files than WebP or AVIF
WebP Modern web pages where you want smaller files than JPG/PNG Not universally supported by very old software
AVIF Smallest file size among the listed formats Newest format; weakest support in older viewers
ICO Favicons and site icons Not a general-purpose image format
BMP Legacy software that expects uncompressed bitmaps Very large files

The tool's own labels match this: JPG is marked "max compatibility," PNG "lossless + alpha," WebP "modern web format," AVIF "smallest size," and ICO "favicon ready."

Balancing quality and file size

The quality control is the main lever. At the default 90% you get a file that is visually close to the original for most photos. Dropping toward 75% — the default shown in the separate compress tool — cuts size further with usually acceptable results for web use. For PNG output, quality settings matter less because the format is lossless; to reduce a PNG's size you would typically resize it or convert it to WebP or AVIF instead.

When conversion fails or the result looks wrong

  • Unsupported or damaged source. If the file will not load, confirm it is one of JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, or SVG, and try opening it in an image viewer first to rule out corruption.
  • Transparency disappears. Converting a transparent PNG to JPG will drop the alpha channel, because JPG has no transparency support. Keep PNG, WebP, or AVIF if you need transparency.
  • Animated images lose motion. GIF is accepted as input, but the listed output formats are static. An animated GIF converted to JPG or PNG will typically keep only one frame.
  • File is larger after conversion. This happens when you convert a compressed format to a lossless one, or to BMP. Match the format to the goal rather than converting by habit.
  • ICO looks blurry. Include the larger sizes (48×48, 64×64) alongside 16×16 and 32×32 so the icon has a sharp version for high-density displays.

Converting several images

For bulk work, the resize tool accepts multiple files at once with preset sizes (1920×1080, 1280×720, 800×600, Instagram 1:1, Twitter header) or custom width and height, with a keep-aspect-ratio option. Apply one consistent set of settings across the batch rather than repeating the process per file, so the output stays uniform. If your goal is only to shrink files rather than change format, the compress tool handles multiple images with a single quality setting.

A quick verification step

After downloading, reopen the converted file and check three things: the format is what you selected, the dimensions are what you expected, and any transparency or animation you needed survived. This takes a few seconds and catches the most common conversion mistakes before the file reaches its destination.